Adren, along with several other members of his gang, mugged Narisa Adus and her husband, Variner, killing him. Since then, Narisa has been haunted by Variner's Ghost who wants the gang killed to avenge himself and save future victims.
Adren wears a common shirt, pants, and shoes, but is stocked up on a large selection of darts. Attacking him and his friends straight on can be risky. Making a sneak attack or drowning them as Variner's Ghost suggested are easier ways to handle the gang.